大柴旦镇绿草山矿区南部断陷带沉降史研究  

Fault-subsiding belt subsidence of south of the Lücaoshan mining area in Dachaidan Town

作　　者：范文科 黄银宝 党洪量 谈艳 祁发龙 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]青海省地质调查局,青海西宁810000

出　　处：《能源与环保》2017年第11期57-60,共4页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

摘　　要：为了认识绿草山矿区南部断陷带沉降演化史,立足该区以往钻井资料,应用地层回剥法,对研究区中侏罗世以来地层进行了沉降史、埋藏史以及沉降速率的分析研究。研究结果显示,绿草山矿区南部断陷带自中侏罗世以来共经历了4个沉降演化阶段:第1阶段为中侏罗世时期,沉降以负载沉降为主,构造沉降为辅,构造沉降速率约6 m/Ma,基底沉降速率约18 m/Ma;第2阶段为晚侏罗世时期,沉降以负载沉降为主,构造沉降为辅,构造沉降速率约15 m/Ma,基底沉降速率约41 m/Ma;第3阶段为白垩纪为抬升剥蚀阶段;第4阶段为古近—新近纪时期,沉降以负载沉降为主,构造沉降为辅,构造沉降速率约6 m/Ma,基底沉降速率约16 m/Ma。第1阶段以负载沉降为主,说明在侏罗纪成煤期沉积环境较为稳定,可形成层位稳定厚度较大的煤层,第3阶段为抬升剥蚀阶段,找煤时应重点考虑白垩纪时期抬升剥蚀对煤系的影响。In order to recognize the subsidence history of the fault-subsiding belt in Lücaoshan mining area,the authors analysed the settlement history,burial history and sedimentation rate of the middle Jurassic strata by backstripping technique based on the past drilling data.The results indicated that the southern fault-subsiding belt has experienced four subsidence stage of evolution: the first stage is middle Jurassic period,the settlement is given priority to with load settlement and tectonic subsidence is secondary,the tectonic subsidence rate of about 6 m/Ma and basement subsidence rate of about 18 m/Ma; the second stage is late Jurassic period,the settlement is given priority to with load settlement and tectonic subsidence is secondary,the tectonic subsidence rate of about 15 m/Ma and basement subsidence rate of about 41 m/Ma; the third stage is the erosion stage of the Cretaceous; the fourth stage is the Paleogene and Neogene period,the settlement is given priority to with load settlement and tectonic subsidence is secondary,the tectonic subsidence rate of about 6 m/Ma and basement subsidence rate of about 16 m/Ma.The first phase is given priority to with load settlement,which shows the sedimentary environment is relatively stable in the Jurassic coal forming period and forms a coal bed with a stable thickness.The third stage is the erosion stage,the uplift and erosion effect on coal series should be mainly considered.

关 键 词：沉降埋藏史模拟 回剥法 煤盆地 断陷带 绿草山矿区 

分 类 号：TE121.1[石油与天然气工程—油气勘探]